CIRCUIT BREAKERSElectrical Distribution SystemsFigure 7 Simple Circuit Breaker Control Circuit -Breaker OpenTo close the remotely-operated circuit breaker, turn the circuit breaker control switch to the closeposition. This provides a complete path through the closing relay (CR) and energizes the closingrelay. The closing relay shuts an auxiliary contact, which energizes the closing coil (CC), which,in turn, shuts the circuit breaker, as shown in Figure 8. The breaker latches in the closedposition. Once the breaker is shut, the "b" contact associated with the closing relay opens,de-energizing the closing relay and, thereby, the closing coil. When the breaker closes, the "a"contact also closes, which enables the trip circuit for manual or automatic trips of the breaker.The circuit breaker control switch may now be released and will automatically return to theneutral position.To open the circuit breaker, turn the circuit breaker control switch to the trip position. Thisaction energizes the trip coil (TC), which acts directly on the circuit breaker to release thelatching mechanism that holds the circuit breaker closed.ES-15 Page 12 Rev. 0